Ignition and combustion characteristics of single gas-atomized Al-Mg alloy particles in oxidizing gas flow
Ignition and combustion characteristics of single gas-atomized Al-Mg alloy particles in oxidizing gas flow
复制标题
氧化气流中单一气雾化铝镁合金颗粒的着火和燃烧特性
DOI：
10.1016/j.energy.2020.117036
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发表时间：
2020-04-01
期刊：
影响因子：
9
通讯作者：
Yang, Dali
中科院分区：
文献类型：
--
作者：
Feng, Yunchao;Ma, Likun;Yang, Dali
在提高复合固体推进剂中金属添加剂的点火燃烧性能的背景下，研究了单个气体雾化Al-Mg合金颗粒（Al:Mg = 1:1, 20 ~ 210 μ m）的点火燃烧特性。本研究设计了一系列不同氧含量和温度的实验条件，考察了它们对单合金颗粒点火和燃烧时间的影响。采用双相机系统同步测量了单合金颗粒的粒径、点火延迟时间、燃烧时间和总时间。实验结果表明，在各实验条件下，单合金颗粒的时间参数随颗粒直径呈线性增加。由于氧化膜的阻挡，合金颗粒在高含氧量环境下点火时，有较长的点火延迟时间。而合金颗粒的燃烧时间随着环境氧含量的增加而缩短。高环境温度能显著缩短点火延迟时间和总时间，但对燃烧时间的影响有限。在点火和燃烧过程中也监测微爆炸。由于这种现象，合金颗粒的燃烧次数和总次数都比相同尺寸的铝颗粒短得多。(C) 2020由Elsevier Ltd.出版。
Ignition and combustion characteristics of single gas-atomized Al-Mg alloy particles (Al:Mg = 1:1, 20 -210 mu m) have been studied in the context of improving the ignition and combustion performance of metal additives in composite solid propellants. In this study, a series of experimental conditions with different oxygen contents and temperatures was designed to examine their effects on the ignition and combustion times of single-alloy particles. The particle sizes, ignition delay times, combustion times, and total times of single-alloy particles were measured synchronously using a two-camera system. Experimental results indicate that the time parameters of single-alloy particles are linearly increased with particle diameters in each experimental condition. Blocked by the oxide film, the alloy particles have a relatively long ignition delay time when they are ignited in high-oxygen-content environments. However, the combustion time of alloy particles decreases as the environmental oxygen content increases. High ambient temperature can remarkably shorten the ignition delay time and total time, but its influence on the combustion time is limited. Microexplosion is also monitored during the ignition and combustion processes. Because of this phenomenon, the combustion times and total times of alloy particles are much shorter than those of same-sized aluminum particles. (C) 2020 Published by Elsevier Ltd.